Valve-gear.



No. 642,146. Patented Ian. 30, I900.

M. R. MOORE.

, VALVE GEAR.

(Application tiled Feb. 13, 1899.)

(No Model.)

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ljniirisn STATES PATENT rFIcE.

lllAillTilElV ROBERT MOORE, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO THE ATLAS ENGINE \VORKS, OF SAME PLACE.

VALVE-GEAR.

SPECIFICATION forming part of Letters Patent No. 642,146, dated January 30, 1900.

Application filed February 13, 1899. Serial No. 705,384. (No model.)

To aZZ whom it may concern.- which the motion is communicated in work- Be itknown that I, MATTHEW ROBERT ing the valve. MOORE, a citizen of the United States, resid- B is a cranlcpin set in the outer end of ing at Indianapolis, in the county of Marion, this arm and extending parallel to the axis of in the State of Indiana,have invented a certhe valve-stem.

tain new and useful Improvement in the B is an extension of oblong rectangular Valve-Gear of Corliss Engines; and Idoheresection on the inner end of this pin. Upon by declare that the following is. a full and this extension are secured by a transverse clear description thereof. bolt B and nut B two exchangeable catch- [0 The improvement relates to the hook and plates B B the edges of which serve for the the adjacent parts by which is effected the alhook to engage and from which it is detached ternate connection and disconnection of the again at each revolution. positive working mechanism with the arm of G is the upper end of the dash-pot rod C, the valve-stem. I provide an improved conwhich is connected to an ordinary vacuum 15 struction for receiving the action of the hooks dash-p0t, which effects the rapid closing moto open the steam-valves. I inclose in a just tion of the valve. The front of the pin B is sufficiently larger recess in the hook a softformed with a removable flat head B secured surfaced pin set in the operating part which by a screw B serves as a silent and efficient stop to restrain D is a hub mounted with liberty to turn on 20 any excess of turning motion of the hook. I the end of the valve-stem bracket and havprovide by the construction of the hook for ing an arm D, equipped with a crank-pin D performing the double function of a pushextending inward or toward the cylinder, by down and a means for further insuring the which motion is received through a link E engagement of the hook. from the wrist-plate G, and thus partaking of 2 5 The accompanying drawings form a part of the positive rocking motion of the latter. The this specification and represent what I concrank-pin D is extended on the outward side sider the best means of carrying out the inof the arm D, forming a pin upon which the vention. hook-lever is pivotally mounted.

Figure 1 is a side elevation. Fig. 2 is a cor- I will designate the entire hook as M and 30 responding view ofaportion onalarger scale. indicate special parts thereof by supernu- This shows the hook in the act of descending morals, as M, the. There are, as usual, two to be engaged. Fig. 3 shows a corresponding arms to the hook, set in this case nearly at view of certain portions at a later stage. Fig. right angles. As the lifting-arm D describes t is a corresponding plan view. Fig. 5 is a its are up and down with the regular motion 35 plan view of a portion corresponding to Fig. of the engine, carrying the hook by its pivot 4, but more fully shown. Fig. 6 is a view of D the upper arm M of the hook serves as a a portion of the hook and also showing in seccontact-piece to engage the shifting earn P tion the extension and its catch-plates with and trip-off at the variable periods required, which the hook engages. while the lower arm M carries the hook-piece 0 Similar letters of reference indicate corre- M which engages at each lifting motion with 0 sponding parts in all the figures where they the lower catch-plate I5 and lifts the arm B appear. to open the valve, and then when it is de- A is a side of the cylinder or of the casing flected inward by the contact of the cam P which incloses it, and Aa bracket bolted rigwith the arm M effects the unhooking.

5 idly thereon, which serves as a bearing for I effect thepush-downtoinsure the clos- 5 the extended valve-stem. A contracted exing of the valve should the dash-pot fail to tension serves also as a bearing for the cameffect it promptly by simply producing a deep ring. offset M in the outer face of the lower arm B is the valve-stem, and B the ordinary M of the hook and arrange to allow this off- 50 stout arm, rigidly keyed thereon and through set to strike the upper catch-plate B whenever the descending motion of the latter is tardy. The construction of the push-down in this manner simply as a sufficiently large offset in the outer face of the arm M of the hook simplifies the mechanism. The hook alone performs all the functions of the ordinary detachable push-down and in all cases where the push-down comes into play receives the strain favorably to promote the engagement of the book. It will be noted that the hook descends in a slightly-deflected position and that consequently any resistance to the descent of the hook is felt on the under side of this offset M near its outer point and tends strongly to turn the hook in the proper direction to insure its engagement by the hookpiece M Thus the push-down offset does double duty. The contact of the wide offset M with the upper catch-plate insures the instant turning or swinging of the hook to cause the effective engagement of the hook-piece M with the lower catch-plate, so that the moment the motion of the hook is reversed it begins to lift the dash-pot and opens the valve. There are three agenciesgravity, inertia, and contact with the catch-piece-which insure the engagement of the hook.

P is the ordinary cam-ring, loosely surrounding the valve-stem bracket and having an arm P, to which is connected the cam-rod Q, which extends to a governor (not shown) and is operated thereby in the ordinary manner. P is the governing-cam carried on this ring and movable therewith as it is partially rotated in one direction and the other by the action-of the governor, so as to receive the swell M at earlier or later periods and swing the hook on its pivot, causing it to detach and allow the valve to close at the right times to effect the regulation. P is an ordinary safetycam carried on the same cam-ring, which performs its usual function of completely stopping the engine when through accident, as the breaking of a belt, the governor loses its ordinary control.

My construction works in all respects in the ordinary manner, except that the hook engages more surely. It insures the prompt change of-- the point of cut-off with every change of speed,attains the perfection of regu-v lation and the economy in the use of steam for which the Corliss engine is justly Valued, and allows the engine to be worked with any velocity without developing any centrifugal force in the hook to oppose the engaging motion. The arm M may be made considerably heavier or arranged to have more leverage than the arm M, and in such case the centrifugal force will tend to facilitate the engagement; but even if this arm is made with only a slight excess or of about equal weight and leverage the opposition to the engagement, due to the centrifugal force with the ordinary arrangement hooking inward, is entirely avoided. In the ordinary arrangement a spring is used to effect the engagement; but in my construction the hook alone without a spring will engage with certainty. My experiments indicate that the hook will catch at any speed. The shoulder or offset M is faced with leather to make the engagement silent.

T is a hook-stop covered with leather to act silently, set firmly in the face of the lifting arm D and received in a sufficiently larger recess m in the hook. There should be sufficient liberty to allow the proper motion of the hook, but not enough to allow the same to get much out of its proper place under any conditions.

Modifications may be made without departing from thmprinciple or sacrificing the advantages of the invention. The hook-piece M is shown as square, detachably secured by a bolt and capable of being shifted to present each side of the several edges successively, thus giving eight surfaces to withstand wear. The catch-plates B are square and correspondingly changeable, giving a corresponding number of edges to be successively presented for wear; but a less elaborate construction of these parts will serve.

I have shown the contact-piece M on the hook as easily exchangeable to allow for wear or to substitute a different size or form when required. This feature may be omitted, a corresponding swell being'formed integral in the arm M and a sharp angle formed integral in the place of the exchangeable hook-piece M In such case the cam P and in case of accident the cam P will contact directly withthe body of the hook and the parts will operate the same, but they will not be so durable.

I claim as my invention- 1. In a Corliss engine, having the valvestem 15 with its arm B, the combination therewith of the hook M, the pin B having an extension 13 adapted to carry the two catch-plates l3 and securing means as the bolt 13 and nut B and the removable head B and securing means B therefor, all substantially as herein'specified.

2. In a Corliss engine, having the positivelyrocking part D carrying the soft-surfaced stop T on its face, the valve-stem B with its arm 13, and the cam-ring P carrying the cams P and P the combination therewith of the hook M arranged to be engaged by an out-- 

